Air masses
A) are humid.
B) typically form over heterogeneous surfaces.
C) typically move away from the source region after they have formed.
D) often form over medium-sized lakes.
E) have large horizontal temperature gradients.
C
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The endosymbiotic theory suggests that the following eukaryotic structures were derived from prokaryotes living inside early eukaryotes:
A) the nucleus. B) the nucleus, mitochondria, and chloroplasts. C) the mitochondria and chloroplasts. D) all eukaryotic organelles, but not the nucleus.
During the day, mountainous regions tend to experience a ________, while at night they experience ________
A) valley breeze; valley breeze B) valley breeze; mountain breeze C) mountain breeze; valley breeze D) mountain breeze; mountain breeze
Greenhouse gases in Earth's atmosphere include ____.
A. oxygen, carbon dioxide, water vapor, methane B. nitrogen, carbon dioxide, methane, nitrous oxide C. sulfur dioxide, water vapor, methane, nitrous oxide D. water vapor, carbon dioxide, methane, nitrous oxide E. water vapor, carbon dioxide, methane, argon
The speed of an electric signal in a typical circuit is
A. about the speed of light. B. about the speed of sound. C. a snail's pace. D. none of the above